As per the subject, there is no option I can see in Autocorrect Options to turn off Writer automatically spacing out three dots. The decision to enable this feature by default is a bit strange… If you want more than three dots it gives you weird spacing.
Its a bit trollish to not make this easy to find in the Options… Disabling other useful features by turning off all of autocorrect is not really a solution… how can I disable the three dots autocorrect? Any info much apprec.
The three dots are an ellipsis so look for that setting in AutoCorrect .
If you need more than three dots then you should be using a tab with dot underline, or possibly a character style with dot underline.
Ellipses is also not in autocorrect options 
I am using the latest build of Libreoffice.
Look for .*... in the Replace field.
Sorry for the screenshot in Spanish.
Version
Version: 25.2.7.2 (X86_64) / LibreOffice Community
Build ID: 5cbfd1ab6520636bb5f7b99185aa69bd7456825d
CPU threads: 8; OS: Windows 10 X86_64 (10.0 build 19045); UI render: Skia/Raster; VCL: win
Locale: es-AR (es_AR); UI: es-ES
Calc: threaded